The mangaka's tastes changed through the manga (Shota, it's explained in Ch 8.5, which is mostly an Afterword).
So in the first chapter they both are sekes and "manly" men.
But from the second one till the end you can watch the less "manly" guy (ukeish) transformation. At the end he is the boy from the cover.
However, Kareshi Glamorous is really funny, or at least I think so, and it isn't as Shota as other Watanabe Asia's manga.
Kareshi Dynamite (chapters 5 to 7), has an interesting couple. One of the guys also shrinks a little bit, but not as much as the one from the first story. One guy is a nympho with super strength, ha ha, and the other is the first story seme's big bro.
Chapter 8 includes a great revenge from the ukes and an awesome line: "It's lesbian sex! There's no man out there who'd let this opportunity slip by!".
Her humor is quite amusing.
Hope you read it and enjoy it (〜￣△￣)〜
Oh, but you shouldn't trust me without reading others comments.
Here are some thoughts without spoilers:
http://www.mangago.me/home/mangatopic/847022/
http://www.mangago.me/home/mangatopic/872443/
http://www.mangago.me/home/mangatopic/900744/
http://www.mangago.me/home/mangatopic/812295/
No you convinced me :) I'll read it!! Thanks :D
haha, I read it's Seke... but seeing the cover I SO CAN'T picture it ^^