I read this a long time ago and it might have been in literotica or in stories.xnxx.com. It is about this boy who is a heavy sleeper, he has a female childhood friend and they occasionally sleep together. The female friend takes advantage of him in his sleep and unknowingly takes his virginity. This guy is a great lover even when he is asleep and word of this gets out and his female friend is forced to share him (he is shared when he is asleep so he is unaware of it). He is shared with an Asian girl who has a dojo when they went camping and she ends up pregnant. The guy eventually learns of this and feels betrayed.
Would greatly appreciate if you can help me!