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kanon asked a question

there was this bl manga i remember but i can’t remember the name T_T
it was about this boy who i think either had bad headaches or couldn’t sleep well, and he meets this happiness fairy who when they sleep together (not sex) he feels better
then i think they start having sex and he feels back to normal and the fairy leaves, saying it wants to learn more or something and it will wipe the boys memories so he forgets about the fairy
but the fairy didn’t do it and the boy still remembered him, and they reunite later on
pls help if u remember this one, i have read it i just can’t remember the name at all T_T