By chance, I stumbled upon my sisters' AV viewing party. As an older brother, I think I should be careful, but considering my recent relationship with my younger sister, I decided to leave it alone... However...I can't help but wonder what happens on the other side of the wall! ! When I try to leave the house to kill some time outside, my sister's friend spots me and stops me! ! Then, when she suddenly asks me to go with her and takes me to the bathroom, she starts playing with my crotch, saying,"I got horny while watching AV...right? It's okay, right?'' ! What's more, she took off my pants, checked my penis, and started intertwining her tongue with me...! ?