I think the BF is hiding a secret. He's probably far from boring.
And if you mean in the sex department I think you're mistaken. Jessica only needs to guide him to exciting situations at the moment. He already agreed to fuck in public and fucking in front of spectators. It's only a matter of time before there wil lbe a 3some with Heather or Jessica's sister.
For you it isn't but for me female protagonist who only fuck one male character is boring, that's why I find it boring also is because bf and gf sex is a common thing, it's a natural thing to do, just like eating everyday nothing special, it's not turning on at all especially in this kind of story where the BF is automatically the BF right from the very start, there is no tension build up, no relationship development, just instant fucking right from the start
I'm not mistaken, I'm quite sure there is a corruption path (There's a Netori tag) here like other female protagonist game that I loved, and I already saw some of the setup scenes here like for ex. Jessica and the old man, and a swinging foursome maybe, so why did you say I'm mistaken? please don't tell me it's because you're thinking that by saying threesome, Jessica will only do sex act with girls aside from her bf because that's wishful thinking