Looking for a doujinshi by description, pic unrelated.
All I remember is it's a "sibling comes home for the holidays" thing, the sister sits outside her brothers window or something jilling herself while she watches him masturbate, he comes and gets come on her face without him knowing, he notices her, he's all "It's only natural for guys to do this", she comes into and leaves his room but sits in front of the door, peeking through the crack, he notices again, they fuck and have a complete mental breakdown.
Also, pretty sure it was based on characters from some idol show, love live or idolmaster maybe?
1000x internets to anyone who recognises this.
>>14976694
Fuck it, don't worry senpaitachi.