My Sister and Her Fuckable BF
Copyright© 2026 by Daydreamz
Chapter 4
Coming of Age Sex Story: Chapter 4 - My mysteriously virgin older sister and boyfriend have to be rescued - from being oneupped by me and my gf now that we've got ourselves laid: see Stunning Girls Run in the Woods! (As before it's narrated by our hyperactive teen girl, so don't skim it!)
Caution: This Coming of Age Sex Story contains strong sexual content, including mt/ft mt/Fa ft/ft Teenagers Consensual Lesbian BiSexual Heterosexual Fiction Sharing
“No, it just went down again, after a bit.” Rob knew what was coming. I suppose he must be reasonably clever, for Cath to be interested.
“You must’ve been a bit tense,” Tilly pretended to sympathise. “Older woman and everything.” By now she was gently stroking his great big erection, with her magic fingers, and smiling at him with her incredible face.
“Yes,” he was too honest to pretend. “But it was working at least.” He was sounding a bit breathy.
“She’ll have been loving it.”
“I wouldn’t leave it too long babe...” I advised.
“Oh!” Tilly giggled and let go. “It is my turn isn’t it.” She checked with me and Cath for a moment and sat up.
I pulled on Cath and we moved right to the edge, so Tills had room to sit astride him. Rob lay there smiling up at her while she straddled him, lifted it and lowered herself onto it. Its big dark-pink head gradually disappeared into her glistening pussy, between her pink, glistening labia! She was gasping quietly as she lost her consensual virginity. Cath stroked her thigh as she settled. If it was hurting at all, Tills wasn’t caring.
I got up and went round to the other side, sat on the edge and caressed Tills’ amazing body from the other side, while she began fucking up and down - shoulders, hair, tits and neck. Kissing them too. Cath started doing the same. I was hoping, and I knew Cath was too, we could help Tills cum with Rob - which was going to mean quickly!
He seemed to be getting this plan too, as he lay still while Tilly rode him. He had a big grin on, with us three girls all kind of doing sex with him at once. Perhaps he likes girls ganging up on him.
He was gazing up at Tills, into her amazing blue eyes, tuning in to her, and she was gazing back, like I had, into his lovely light-brown ones, for several minutes, drifting into another world. I was feeling it with her, as well as feeling her firm, slim, feminine body while she used her superfit quads and glutes to glide her fizzing vag up and down his big male shaft! Then Cath kissed her neck and that was the final trigger and she lost it and was cumming, and he was cumming with her, grunting, stroking her too while she was milking his big spurting cock, way up deep inside! And I was stroking him too now, while they both jerked and shuddered in ecstasy together.
Tills slowed and grinned round at us.
“Nice first time?” I joked. She knew I meant proper first time.
“Yesssss,” she sighed beautifully as she sagged sideways into my arms, warm and gorgeous and super alive.
Rob was shuffling sideways into Cath’s arms, making room for me and Tills to lie on the bed together. We all just lay together like that for a couple of minutes, stroking and feeling.
“We need our own boyfriend,” I said. To Tilly but so all of them could hear. I mean, how long would Cath have to wait now?
“I don’t see why,” said Cath, reaching over to comb fingers through Tilly’s hair. She’s more patient than me. Also, super protective, and generous.
“How many can a guy do, or I mean how often?” I asked everyone.
“Have to ask,” Rob was reaching for his phone, and the rest of us did too.
We looked it up for quite a few minutes.
“It’s all over the place,” I commented.
“Sometimes it doesn’t even go down, by the sound of it,” Tilly agreed, “or other times it’s like 24 hours! Or for married people they say stupid things like twice a week!! I’m never getting married!”
“We’ll just have to find out, for ourselves,” Cath handed us her big sister verdict. “And just look for someone else if we need one.”
“Excuse me!” Rob was jokingly indignant. “Suppose I don’t feel like it?”
“Yes sorry,” Cath was gently fondling his floppy dick, with a grin, “only if you fancy all of us, obviously.”
He just laughed. He has a really nice laugh.
“But we have each other too,” I gave Tills a squeeze, and she squeezed me back.
“Anyway let’s watch the movie,” she suggested, and that’s what we did.
Then when it ended it was dinner time, with Mum blatantly flirting with Rob, but not seriously, like she’d told Dad about the sex lesson, Dad thinking that was funny, and everyone knowing everything without actually mentioning it. And then the four of us came back up and got back into bed.
We all knew what was next, because Cath had become the only one in the house her own boyfriend hadn’t fucked. So that was about to change, or there’d be trouble.
Tills was in her usual telepathic tune with me, so we were on the same plan winding each of them up. Not that Cath needed motivating of course, it was more that feeling and seeing her sexed-up would help Rob with his revival. It’d be his fourth in one day after all.
So it was Tilly working on Rob, and me on Cath - sister/sister was new and likely to work on a 16-year-old boy, a bit more than just underage schoolgirl lezzing he’d seen already.
Rob and Cath were in the middle, with me and Tills on the outside. Tills was using her magic fingers, lips and hair all over Rob, while I stepped into the taboo thing on Cath. She was lying on her back, with her left leg over on Rob’s right, for him to stroke.