Yes, this is intentional. That specific route has some differences to what happens if you stay in Riley's room, as you may have noticed. This is the only route where Cassie actually knows that Riley is MC's girlfriend (Assuming she is), or what happened at the party in general. In the next update they're intended to have a bit of a catch up where Cassie is told about all that stuff if she doesn't already know, but the conversation is also a catch all for things like this. It's likely that Cassie herself will ask Riley if she's told MC about the lesbian thing, prompting Riley to have a bit of an "OH SHIT!" moment. Should be fun.
Granted, it didn't start intentional. Initially I just straight up forgot to put it in the scene and only noticed a few months later. I do that sort of thing a lot though which is why you sometimes have the same thing happening in different scenes. (For example, Hikari inviting you shopping might not happen depending on your choices, but if it doesn't happen then she'll either do it later, or you might offer to take her shopping instead. I didn't want to just force her suddenly asking you to go shopping into a scene where it doesn't really fit the conversation, when I can just have her do it later instead in a different conversation)
I like it this way because to me it almost feels more natural. If I forgot to make Riley bring it up, then maybe Riley forgot to bring it up. I get a bit tired of that trope of characters never actually forgetting things. I'm aware that that sort of thing is usually necessary to keep a plot engaging, and in things like a movie having a character just forget things usually serves no purpose, but to me stuff like that is what seperates a character from a real person, and I'm aiming to make the girls feel like the latter as much as possible. (Keeping in mind all the wacky porn game bullshit)
Hah, thanks. That's kinda exactly what I was going for. School based harem is possibly the most oversaturated genre in AVNs imo, and I knew going in that unless someone already knew what the game was like, it was just gonna look like yet another school based harem game (Which I guess it is).
I'm hoping over time the things I put in it to try to make it different end up with the game speaking for itself and word of mouth convincing people to try it who otherwise dismissed it as another alright generic type game. (As you say)
No idea if it's gonna work, but with so many games being released every day it feels like, I think the game needs to speak for itself, especially in the school based harem. Hopefully I can make this game do that.