The agarest war series is pretty good in regards to being fanservicey without actually being porn. The game's story is split between multiple generations so you'll start as one guy then move to his kid and so on and so forth and depending on which waifu you pick the child will have different stats/specialties. Be warned, the game is an SRPG, and a surprisingly difficult one at that. The PC versions are also partially censored, omitting certain CGs involving the Loli-type characters.
Utawarerumono is also another SRPG series that has a fair amount of Fanservice but also a really good story. I mean REALLY good. It actually started as an Eroge but had a non-hentai re-release on the ps2 way back when. The series had a recent revival with 2 sequels, mask of deception and mask of truth that are both out on PC, PS4, and Vita. The remake of the original is coming out towards the end of may so it's a good time to get interested. Then again, I don't know how this whole covid thing is gonna play out in the coming months so who knows.
Xenoblade 2 is a more traditional JRPG with a lot of fan service heavy designs. It takes a while for the story to really get going but I think the world and characters make up for it as you go along. It's really grindy as you hit the end-game though.
Finally, Catherine is a good one. It's a puzzle game with a supernatural horror angle to it's story. It's the epitome of that "mark me down as scared AND horny" meme in regards to it's 2 (or 3 with the remake) main romance options. The remake is coming to switch soon and is already out on ps4 so yeah, take your pick.
