Itadaki! Seieki♥

Hentai involving a succubus girl and several guys. The girl's personality changes as she loses and gains control of the situation she's in. Both have great animation, character designs, and a sexy girl with a great VA. 

Both have a sexy succubus gets attached to a human. Both have lots of big tits. Both have really great artwork that helps draw you in. 

Love (probably) emerged from a succubus with the supposed victims. Reverse rape turned into vanilla. 

Both animes have a normal MC with a vampire falling inlove with the MC. Both are funny and have a cute vampire. Also both does indecent stuffs or smth 

Both are hentai that feature a vampire/vampires and one lucky guy, alright being more specific, Itadaki! Seieki♥ has a half vampire half succubus (and honestly the later one is more apparent), but vampire at the end of the day and they are some of the few hentai with vampires, so they both deserve the recommendation, besides both have a fixation on big boobs, so there you have another similar point. 

- Both anime are hentai genre. - Heroine in both are half-succubus. Mari is vampire + succubus, and Saki is human + succubus (splitted into 2 entity after several times having sex) 

Both are hentai with monster girls (succubus) and both have bit of comedy. 

Both shows are light-hearted and has entertaining characters, which is rare for hentai titles. They both have a pseudo-NTR/Rape scene, but they both end up with the girl comically dominating the guys and enjoying it. If you want something light and silly, these two are very similar. 

Both have succubi, tone of humour and memorable characters.