I heard some strange noise in the classroom so I took a peep.. and I cannot believe what I've just seen.. That beloved Arisa-senpai was naked with a man and doing it so intensively..Don't.. if someone comes in..Worried senpai was murmuring and the man who I've never seen was massaging Senpai's plump breasts and clumsily shaking his bodyI was so irritated by that man and felt jealousy towards him. But as this was my first sight of a sex scene.. my nipples are hardening and my lower body was soaking wet..Hmm..hh...Ahhhmm..I was holding my breath.. and started to masturbate..