I just thought of a Phase fangame idea, It aesthetically looks like OG Doom with a hand an arm in the middle, except it's the players d*ck. You go around the level trying to find the Oshi of the level but all throughout the level there are femboy fanbases trying to drain your "cum meter" you have a white bar on your screen, you need to have cum left over to impregnate the oshi, your score is based off of how much cum you put inside the oshi. So let's say you go into level 1, a hamcel starts coming towards you ass first, you have to dodge him and find Eimi somewhere in the level. There could also be "speed" levels where you're scored by how fast you catch the oshi. There could be himbitos trying to jump on you and slow you down as you run after Muyu, when you finally catch her you pin her down and ring her cow bell.
Anyways just a thought I had while reading the Phase monetization posts.