My sister attacked and forced me to have sex while I was sleeping! HUNTB-403

He wanted to comfort his dumped sister, but his careless and unguarded state caused him to involuntarily get an erection. While thinking these complicated thoughts about his sister's erection, he thought, "Look at me, getting an erection? I'm so happy. Brother really likes me too, right? Let's make a baby together." Then his sister greedily took his erection... He refused, thinking it wasn't going to end well. Unexpectedly, he was attacked and forced to ejaculate inside her while she slept. His sister then went straight to school, leaving his sperm inside her all day, and then again when she got home...