Heroine selection in the order in which I'd recommend them:
Kinkoi
Kakenuke Seishun Sparking
Fureraba
Marshmallow All the way Home
Hatsuyuki Sakura (FYI not sure I'd call this a romance game, but it does contain romance)
Study Steady
Magical Marriage Lunatics
Featuring the heroine confessing:
IxShe Tell - every single heroine does it.
Gin'iro, Haruka - specifically Hinata's route
Oshirabu (yuri)
A bunch of the Sonohana games (yuri)
Technically every NekoPara game I've read
Angelic Chaos Reboot - specifically Amane's route IIRC, but with the way this one is set up I think Kaguya did too? Maybe Fumika did too? This VN gets real blurry on it in general since one of the main plot point's is the MC's erectile dysfunction.
Hapymaher - Saki
Chrono Clock - Michiru - seriously a ton of imouto routes do it.
A lot of the single route VN's (I mentioned two yuri options above) feature the heroine confessing first.
I'm sure I'm forgetting quite a few to be honest, but in a lot of the VN's - including some I mentioned above - it's played off more as a joke than a serious confession a lot of the time. imouto routes feature quite a few "caught masturbating then crazed confession then embarrassment and avoidance" storylines.
The only 100% serious one above is Gin'iro, Haruka, and slightly less serious but still real are a bunch of the Sonohana ones, the rest get played off for laughs on some level.