[Of course that's just the moment when Soushi does pull away, not entirely but he does sit back enough to look down at the other. To see his flushed face wrinkled with desire, to see what he already knows through their connection.
With the bit of space between them now, he grabs the hem of Kazuki's shirt and pulls it up with the intention of removing it completely. It's in his way. If Kazuki wants Soushi to remove his as well, he'll have to catch the other before he is successful in his own goal.]