No God in Eden Vol. 04 by Yuma Ichinose

Thanks to a last-minute save by Takai’s father, Takai and Nishio manage to ditch their study camp before their fellow classmates catch on to Nishio’s condition. But now they have a bigger problem on their hands—how will Takai persuade his parents not only to allow Nishio to stay in their home, but not to disturb the two of them for his entire week-long heat cycle? With his parents noticeably suspicious, has the time finally come for Takai to expose their secret?