Looks like the eroge, Gift is finally available at the Apple App Store. Only the Japanese version is out so if you are like me and still haven't learned your Japanese yet (^^;) don't fret, the English version will come out soon.
So glad to see a real anime app for once. A bit pricey though for an app at $12.99USD, but it might be worth it.
Check out the game's main site here.
A bit of a warning..there might be eroge CGs in your search.