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The side pairing in The Sweetest Man. http://www.mangago.zone/read-manga/dalkomhan_namja/?av=1 Gunchan fits. He's so chill all the time, he's such a badass. He's the type to call on other people's bullshit with a straight face. Incredibly blunt and pensive.
There's also Towada from Lie Cry Like. His attitude is different from Gunchan but I think it still fits. http://www.mangago.zone/read-manga/lie_cry_like/
Makino's a corporate spy so the only time he smiles is when he's on the job. Not stoic? but his true self rarely smiles.
http://www.mangago.zone/read-manga/ou_sama_no_koi_asobi/
For the second one, I recommend Golden Sparkle. He doesn't know anything about masturbating. He's innocent but he's blunt and straightforward.
http://www.mangago.zone/read-manga/golden_sparkle/
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First one that came to mind
http://www.mangago.zone/read-manga/sick/
Like immoral sandwich where the uke just doesn’t really care. Or like one where the uke hasn’t experience love or anything sexual at all and his straight face breaks a little bit.