Chapter 16: Mysterious Errand

In the six weeks since our camping trip, Tanya and I weren’t able to keep up the insane amount of sex we had managed those first few days. However, we were still averaging better than sex once a day. Throw in a few blow jobs a week, and Tanya was consistently getting me off an average of twice a day. We were more cautious when it came to me eating Tanya out. Every time I ate my sister’s pussy, it had a stronger and stronger effect on her. I guess I was getting better at it. However, since Tanya was the one we counted on to keep our parents from noticing that we were having sex with each other, we couldn’t risk Tanya going mad with the need for my cock. Now, just because we were averaging having sex with each other better than once a day, that didn’t mean there weren’t still days when we couldn’t manage to hook up safely. That always made the next day a little dicey, as we were both insanely horny after a dry day and weren’t necessarily as cautious as we should have been. Thankfully, we had managed to get through those desperate days safely. Weekends were the least predictable. Twice, we got long blocks of time together, and we were able to enjoy each other’s bodies multiple times and in whatever way we wanted. Twice, we couldn’t manage to get away from our parents at all. There was nothing to do but wait until we got home from school on Monday. After two days without sex, we pretty much attacked each other as soon as we got home. On both occasions, we started screwing in the living room and barely managed to get all our discarded clothing picked up, and the two of us back to one of our bedrooms before either of our parents got home. We still weren’t out of the woods, because after two days without relief, we kept fooling around until we were called down to dinner. I was trying to figure out what my prospects with Tanya were this weekend when Mom told me that she and Dad were going out to run errands. That came with the instructions that we would be going out to eat as a family, so Tanya and I shouldn’t make any plans with our friends. Of course, any time I heard I would be alone in the house with Tanya, I started to get excited. Hopefully, Mom would never guess that I would always pick being home alone with my sister over going over to a friend’s house. As soon as our parents drove away, I went up to knock on Tanya’s door, “Hey, did you hear that Mom and Dad are running errands and want us to stay put around the house? Like we’d waste prime incest time by doing something with our friends.”

“Yeah, Mom was all mysterious about what she and Dad were doing when she told me. Don’t come in yet; I’ve got a surprise for you.” Tanya had a surprise for me? Now I was really excited. I stripped naked, my cock hard and throbbing in eagerness for my sister, and tossed my clothes in my room as I waited to see whatever surprise Tanya had in store for me. My eyes nearly popped out of my head when Tanya let me open the door to her room. She was wearing a blue nightie with matching panties, but what really caught my eye was that the nightie was almost completely see through from just below her nipples down to her belly button. It reminded me of what she had worn on the camping trip that had started us down this path of sibling love. In short, I loved it.

“Mike, I’m supposed to be surprising you, not you surprising me by showing up in my room naked. Well, don’t just stand there staring; let me know if you like it.”

“Fuck! I love it. Let me show you what it makes me want to do!” I got in bed with Tanya and straddled her torso. Then I lifted up the nightie and pressed my cock against her belly before guiding it between her breasts. It was awesome; I could see my cock disappearing between the undersides of my sister’s tits before it was hidden behind the non-see-through part of her nightie. Then I could see the head peaking out at the top of her cleavage as I finished my thrusting. Then I grabbed Tanya’s tits and massaged my cock with her round mounds as I fucked her knockers. “Damn, I’ve wanted to do this ever since I saw you in that crop top on the trail.”

“Well, if you wanted to fuck my tits so badly, why didn’t you just say so any time in the past six weeks?”

“Oh, I thought you would think I was weird. And then there was all the normal sex and blow jobs too.”

“Like I don’t already think you’re weird,” Tanya teased. “I have to say though, I didn’t think I’d get anything out of a tit fuck, but it’s really getting me hot and bothered, big brother!”

“You think you’re hot and bothered,” I panted. “If you don’t want to get stains on the nightie, we need to stop.”

“I’d love it if you stained this top with your seed!” was Tanya’s reply. Hearing Tanya refer to my jizz as seed totally sent me over the top. I came so hard that more of my spunk ended up on Tanya’s face and in her hair than on the nightie itself. “Fuck, that was intense,” I moaned as I milked my shaft of any remaining cum with Tanya’s big tits after my orgasm was complete.

“Ugh, now I want to get off, but it’s going to take a while to recharge your cock,” Tanya grunted as she arched her back.