I enjoy to play this game and like the overall drawing style. Considering the contente I would like to leave a short story idea here:
How about a short and skinny gay guy who who is bullied by huge and muscly hunks in his gym. In achieving his ideal body he will bring his "boyfriends" to merge with him to get more muscular to show his tourmentors the ropes. After the first sessions he will get more power hungry and do a permant merge with his friend. While growing bigger, taller, more hung and muscular he will attract bigger guys who he tricks to merge with him to get even more powerful. It could be a similar content to the thug content in the game.
This is just an idea.
Keep up your work and this overall development!