Renryuu: Ascension

Renryuu is an 18+ fantasy RPG with turn-based combat and beautiful artwork. You start your journey as a threesome, but up to 12 NPCs can join your group during your wanderings. Each heroine (and the vast majority of them will be girls) has a set of art, from simple nudity to sex scenes with the GG, which are unlocked as the relationship improves. There are also a lot of secondary characters in the game (209 at the time the giveaway was created), which can be found all over the world. And most of the minor NPCs have artwork too. The world itself is quite vast, there are many maps and locations, so long exciting journeys are provided.