I knew I had to pick this one up. Incest is a favorite genre of mine. Taboo relationships win. Rito x Mikan from To Love-Ru and Kirito x Suguha are heavily hinted at in the actual shows. Developed by Ammolite and published by French erotic game localizer and publisher Eroges, Oppai Cafe brings that sweet taboo love. Check it out HERE. 

Oppai Cafe is a sweet story about a mother and her daughter and son working at a cafe. The only not-sweet part of it is the dad using his wife and daughter as props to draw in customers, but that works in his son's favor. According to the official synopsis:

Business is not good for our family coffee shop. And there’s a reason for that, a new café on the corner has French maids to serve customers. We needed to find a solution… and quickly. My father decided to change my mother and my sister’s outfits when they were serving, and put them in sexy cosplay to bring in new clients. Before leaving he asked me to keep an eye on them. But … how could I stay cool when faced with my mother’s big breasts and my sister’s provocative outfits … I don’t know how I’ll deal with the situation! They seem to have gotten ideas in their heads since dad left …

Dad of the year right there, equal parts terrible and great. Terrible in trying to pimp his wife and daughter out, great in giving his son a shot with them. So, a knuckle-busting handshake is in order.

You can (and should) buy the game HERE. There's some mosaic censorship, as seen above, and you'll need to register to Eroges' official storefront, but it's painless and worth the effort.