[Itaba Hiroshi] Shinseki Midara My Home Harem Ch.1-4 [castor translates things]

Shuu-chan's quiet stay with relatives quickly becomes a secretive home harem when his doting cousins and niece decide he is theirs alone. The busty, lingerie-clad Midori-nee-chan, a bold gyaru with soft heavy breasts, and the petite, drenched Rin-chan each press their inverted nipples and willing bodies against the sole male, whispering to keep last night a secret while begging to be taken. Their teasing rivalry melts into shameless, creampie-driven defloration as one after another claims his attention and shows how far family devotion can go behind closed doors.