The face he makes is not a pleased one. He has considered that, most likely, Makoto has had to have sex with someone, and he does not like that imagine because he understands Makoto well enough to know how awkward that would be.
After that comes the realization that the most likely person would be Yamato.
His expression becomes something along the lines of 8[ because that's a good face for imagining Yamato and Makoto gettin freak nasty.]
Re: video;
[Hiro considers, now, the implications of this.
The face he makes is not a pleased one. He has considered that, most likely, Makoto has had to have sex with someone, and he does not like that imagine because he understands Makoto well enough to know how awkward that would be.
After that comes the realization that the most likely person would be Yamato.
His expression becomes something along the lines of 8[ because that's a good face for imagining Yamato and Makoto gettin freak nasty.]