Sei-jun Ecstasy: XXX Shinai to Derarenai Heya de Mazoku o Buttaoshimasu - Vol. 1 Ch. 1 - Darkness, Light and Ecstasy

[Encyclopedium]

This is ridiculous, it's beautiful

And good ol' "reverse rape" just like the monster girl quest days

 

[Amiableentropy]

this is the 3rd glowing cock manga i've "stumbled" upon

 

[TheFelixArgyleSimp]

https://imgur.com/a/KyEMK1H