[Shiro is all too happy to keep going, especially when Stein is making delicious noises like that. It's not the volume that matters, it's breaking down Stein so much that his mask cracks and he actually says anything at all.
But he can feel the pressure building up, and he knows that he'll need to switch it up a bit to last longer. So he pauses his movements long enough to sit back on his knees and use his hands to grab Stein's legs and push them forward, closer to Stein's chest. From what Shiro has seen of him, he should be flexible enough to handle that. Plus it lets his dick go in even deeper once he starts thrusting again, which should make up for any time lost there.]
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But he can feel the pressure building up, and he knows that he'll need to switch it up a bit to last longer. So he pauses his movements long enough to sit back on his knees and use his hands to grab Stein's legs and push them forward, closer to Stein's chest. From what Shiro has seen of him, he should be flexible enough to handle that. Plus it lets his dick go in even deeper once he starts thrusting again, which should make up for any time lost there.]