Hey, man. Welcome to the forum, and congrats on releasing your first game. About the tags, there's a planned tag section in the spoiler tag in the OP under Genre you can add them to, and those tags should reflect all the kinks and fetishes you want in your story and plan to add in the next updates. My advice is to be honest and transparent about anything so ppl know what they get themselves into and also get their money's worth, if they decide to support your project.
As crazy or far-fetched as it may sound, I honestly suspect the guy was either the dude who fucked his precious Alice he simps so much for, like you said, OR he could be his biological dad, and the MC's mixed race. It would explain why Linda didn't want to see him and his dad was so angry when he popped up wanting to tell the MC the truth about the supposed 'lie' he's been living in. Any of those two sounds like a possible scenario.
![Unsure :unsure: :unsure:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Screenshots in the spoiler bellow.