This is Nice 3

Saki and Kanako came to a tacit agreement to share Makoto, even if he's officially dating Kanako. The cousins get along, after all, and don't mind sharing. And now that Makoto's birthday is coming up, they decide to surprise him together. It starts as a private party in a rented apartment, but considering it starts with both of them in sexy bunny girl outfits, it's pretty clear it's not going to just end there...