I agree with a lot of the comments here, this story is just so cute~! As with all of Junko-sensei's works, the art makes this even more adorable too! ^__^
What I like the most about this, is how the relationship progresses in quite a natural way. Neither of them particularly liked the other at first, then slowly they became friends, then that turned into more. It's not one of those "fall in love at first sight, confess straight away, then have sex immediately after" plots, it takes a bit of time for them to get that far.
Also as other people have mentioned, both main characters are so loveable! The uke is quite timid, and does cry quite a bit, but once you've found out about his past it's completely understandable! When I first read what happened to him, I was actually on the verge of tears, because it really does seem like something that cruel kids might do. The seme is just awesome really. Read it, and I can guarantee that you'll agree!
I personally loved the sex scene. Some people said it was a little bit forced, but I completely disagree. It happened so naturally, just like everything else in their relationship. I happen to think that their first time together was incredibly sweet, not overly graphic or kinky, just two boys in love taking their relationship to the next level ♥
But if you're not into seeing those type of intimate scenes, then just skip the final chapter. This manga is good as shounen-ai if you only read upto chapter 4. The 5th chapter is where it gets a little steamy.
All-in-all this is a lovely manga ^__^