Taehyun is not a simple kid.
Minho is simply worried about their maknae.
When Taehyun disappears again Minho goes to search for him to reassure the boy that sometimes things are actually simple.

(I'm changing the description because the old one sounded wrong...though it's more too the point...idk...I actually wrote this from the wrong point of view...in my head this whole scene kind of sounded different ><

When Minho is told Taehyun is not in his room he goes to search for the boy and what he finds is more than he expected.

This is not a R-rated story though it sounds like it...)