I’ll give you that blunt advice: if you’re reading it with your dick in hand, do NOT wait, do NOT try to make it last, as soon as your shuttle is ready to launch, out with it, good for you my pervy friend.
With that important precision out of the way, I’ll just say this is a very well drawn h-comic about a solitary man, unpopular with man and woman alive, who finally finds someone who cares for him and understands him. It happens to be a slime, but love knows no borders. The slime eventually finds how to take on human appearance, and the bonding can begin!
By the same artist, I also share Doutei To Mahou No Lamp and Netore! Hacking Keikaku.