Damemoto no Koi de wa, Dame Desuka?

"That... sounds kinda nice." Minami Chihiro has a rare condition—when exhaustion and stress pile up, he develops a fever... and goes into heat. Now in college, he reunites with his old classmate, Shishiou, who aggressively pursues him. Back in middle school, Shishiou once taught Chihiro how to jerk off, and to keep that a secret, Chihiro agreed to a deal: "I'll go on 10 dates with you." Grocery shopping together, cooking meals, hanging out at cafés… Before he knows it, Chihiro finds himself getting swept up in Shishiou's pace—!? (Source: Ichijinsha, translated) *Note: Includes an extra.*