Gay (male) VNs with great writing/humor?

[NadaMucho]

My best friend is gay and he's constantly putting up with me telling him about this or that VN and sharing jokes and good writing. I'd like to recommend some titles but it's not my area. As far as writing/humor I'd be happy to recommend gay titles that are similar to the following (in no particular order);

Being a Dik
Once in a Lifetime
Bare Witness
Grandma's House
Race of Life

Thanks for any thoughts or suggestion!