Hi, I'm so glad and happy about your invitation! I have been thinking about it for days.
I have come to the conclusion that I will "reject" your invitation "for now" for 2 reasons.
1. Honestly, I'm not really that much into working and developing on hentai games. In the first place, I want MY project to be somewhat 3-4 hours long with a meaningful and touching story and also with 2-3 "intimate" scenes (which I'm not certain that I can complete as of right now.)
2. I have less and less free time over the past years as I became in my university junior and senior year. (I have also helped my family start a shop on some e-commerce, which means less free time) That's why I have stopped working on the project this year. As I through right now, I don't have the will to abandon this project, and I still deciding whether I should continue or not.
In the future, If you and I are still in the industry, probably someday I will contact you!