Promising, on the side of gameplay it's solid. I feel like the player characters might be a bit bigger than they need to me and it gives me flashbacks to Super Castlevania IV, but otherwise it works fine.
On the side of sexy stuff the animations are very fluid, and the motion of the jiggly bits is very well done. If you don't mind me asking how come there's no planned actual sexual content though? Making the game 18+ while the only mature thing included is nudity when you lose a life seems like a bit of a weird decision to me. It means anyone younger shouldn't be playing while anyone interested in the game for the adult content is kinda blue-balled.