Little bro keeps waking up utterly soaked, and his boxers all messy. Small hickeys scross his thighsm Each night he tries to find out why, but his big sister says she doesn't know. Instead she just asks how his growth has been. Maybe if he is getting hard more often, he might be getting bigger as well.
That is until he sets an alarm to wake up early and as he snaps awake to the screeching alarm. He sees his big sis with her hair pulled back throating his rock hard t dick. He is in shock but big sis just jiggles. A strand of sticky spit stretching between her pretty lips and his sopping wet hole. "Hey baby bro, I was right. Getting hard more often would help you grow. Just just relax big sister's got you" as you brings her lips back down and taking his t dick in 1 go
this is peak... actual peak..
big sister taking care of her little brothers bottom growth in his sleep, just using him to her hearts content all for the benefit of him being able to use his tdick more often.
him doing nothing but hitching his breath and shuffling up to watch how her lips take him full and how her tongue dips inside of him and back up. the overwhelming heat of his sister's mouth enveloping him until he cums, needy and ready to go back to sleep just to wake up to it all over again 🥰