Incestuous relationship with a cousin I haven't seen in a long time

Incestuous relationship with a cousin she hasn't seen in a long time: Tsubaki Sannomiya and his cousin haven't seen each other for a long time, and now they're all grown up. But the two are so close that they invite each other to fuck each other. Tsubaki Sannomiya's charm is irresistible, so this guy is also very interested. They spent 3 days and 3 nights together making love continuously. Indeed, everyone was greedy for anything new. Where will this incestuous love affair go?