Okatai Anata♂ wo Yawarakaku♀

One night, a succubus name Lily appears before a male student named Lui. When Lui turns down her advance to do something sexual, she possesses his body saying, “I’ll soften up your spirit and body a bit,” turning him into a girl. After that, Lily controls his body making him masturbate, have sex with friends and does whatever she likes...
(Source: Fakku)