It is possible. It is very difficult. I don't recommend it, because for the entire time the spell is in effect, the person will feel...wrong.
It's like when gay people pretend to be straight for societal reasons. It feels wrong. The difference is, when a gay is pretending to be straight...that's their CHOICE.
Casting a love spell on someone is robbing them of their choice. It's like slipping someone a date rape drug, only much worse. It only ends badly. I've never seen it end well (and I've seen a LOT of these)
Better to cast a spell on YOURSELF to BRING love to YOU. Don't target someone specific with it. Cast a spell to bring you YOUR true love. Maybe it's someone you didn't expect, but that isn't a bad thing. That is the only way to do a love spell without messing with free will. Those kinds of spells are easy and work well.
Why do something cruel, evil and difficult when you can get BETTER results with something easy, fun and kind? Try my idea if you want love to come to you. If you need help writing the spell, message me.
PS I'm speaking from personal experience here, not morality. Anyone who wants to complain about me talking morality in a magick site can just go away. I'm talking about what actually WILL happen, whether you believe it to be wrong or not. Having seen many people try this (at least 5 that I can think of...but there are more that I'm forgetting), I can tell you that those kind of love spells never end well.