Hi DEV, sincerely and personally I prefer that in the end the MC becomes a magnate and has a million-dollar patent with his discovery, which leads him to have a harem of big-ass girls. 11/10, of different shapes, races, hair color and nationalities, with the latter opening up a range of possibilities to take to the game to see which or what type of girl will be added to this, Therefore, it creates expectations and also due to your genetics and different lifestyles will affect the enlargement treatment...
I don't intend to impose, it's just an idea, I hope in one way or another the MC has a Harem and if it's a multinational one, all the better.
Greetings and good luck DeV
P.S.: If you can add a redhead with long, radiant hair like fire and white skin with freckles, oops, I think I got carried away with the specifications (redheads are my weakness, since they are the GOAT)