Title: 寝取られ~昔馴染みのパーティメンバーに寝取られる~
Romaji: Netorare ~mukashi najimi no pātimenbā ni netora reru~
Release Date: 2021/04/13
Company, Producer: マタタビ猫soft
DLsite Link: https://www.dlsite.com/maniax/work/=/product_id/RJ320481.html/?locale=ja_JP
It is an NTR game that has been released for some time...