pls help me find this bl

its a rather smutty bl with different little short stories in them.

i don’t remember the specifics but ik it’s definitely not part of the gwanggong apartment complex.

its a fantasy one where ml is searching for someone. i think its mc’s great grandfather? well mc tells ml that hes dead and should like give up and yada yada then they have sex somehow and then more sex then it ends.

remember there being tentacles. they travel together j think.

pls hell