Looking for BL

I dont know if it will be here but i hope at least someone know the name of it.

It is a manga yaoi i read long time ago.

The uke run a chocolate shop. his ex boyfriend or someone he know im not sure have suffer from disease which im not sure what is it ( maybe diabetic or something stomach disease ) that make sugar level dropped.

So one day he walk to the shop and found seme which suffer from the same system cuz he got stabbed sitting on like dark ally so he feed him chocolate with his mouth.

Then the seme show up to his shop with flower to thanks him and the seme is a Yakuza or Gangstar.

The cover is in dark pink or purple-pinkish color. Thank you so much in advance.

It is a very old manga one i got physical copy of it but i don't know where it gone. ╥﹏╥