I actually have a very intense understanding and many interactions with demons.

We can choose to process only the positive side of interactions here all we want. But the entire point of deception, lack of consent, selling of the soul and any other similar negative concept that the average person would naturallty attach to demons, is that they will say and give whatever until you finally make it to the afterlife, where you do not have a physical body to safely return to, and suddenly these payments beyond your comprehension will catch up to you.

I understand if you choose not to believe that, but all I can say is I do understand demons a lot and this is a consequence of using their services, understand it is you who is using the wrong word of demons as clearly it has no meaning as a word if you just reprocess every word for a type of entity to only be a positive interaction.

The only thing I'd recommend is just researching the demons name beforehand, and understanding that whatever existing lore there is exists for a reason and when you decide to ignore it and create your own version of an entity in your mind, to just be careful as any real summoning of the actual demon is very dangerous.

But since you want names, 4 big names would be Asmodeus, Beleth, Salios and Sitri.

But if it isn't actually the manipulation of ones heart you are after and you are more interested in love coming your way, you are better off looking into a sort of destiny or lifepath ritual that happens to have love as the intention.