Hello there! Can anyone recommend any manga where the seme is a playboy and played with th...

I wouldn't call this one a romance, but it fits your criterion:

http://www.mangago.me/read-manga/the_end_of_youth_ai_no_uta/

This one is lighter and happier:

http://www.mangago.me/read-manga/fukurou_kun_to_kare/

And then there's this one:

http://www.mangago.me/read-manga/senpai_no_mizugi/

http://www.mangago.me/read-manga/aishuu/
http://www.mangago.me/read-manga/overdose/
http://www.mangago.me/read-manga/beautiful_days/
http://www.mangago.me/read-manga/deep_flower/

Thanks so much!

Overdose is one of my most fav of that theme