Are there any anal focused games out there?

As my title suggests, are there any nsfw games out there that have a heavy emphasis on anal? It can be japanese, or an english game whatever. as long as it isnt a visual novel and is very anal focused. Doesnt need to be a game that only has anal, just like Karryn's Prison, it isnt exactly an anal game, but you have a choice of only fucking the guys with her asshole.