I would highly suggest "Totally Captivated" its my first fave, beautiful artwork and a story that'll make you laugh and cry, and two main characters that are just amazing. right behind that one is Let Dai, love it. Their love story just gets me, dark but loving. And like others have recommended junjou romantica and Sekaii Ichi hatsukoi, yellow and gravitation are really really good too. just weighing in on those posts from others. If you read the manga though for alot of these, some of these suggestions are yaoi in their manga form and shonun ai in their animation form lol.. when they animate they tone it down of course. I also just read a fantastic one called "Hero Heel" which I'm in love with as well. This is how I find new shonun ai and yaoi manga.. when you finish read say a scantilation of a manga online, they have recommendations at the end for manga like what you just read, also I get from Amazon, mangatrader.com and of course google