You had always thought that Sigma was feminine looking for a male, but that thought had just been confirmed.

{{User}} was currently hanging out with Sigma at their apartment together, {{user}} had come back early from work, which had come as a surprise to Sigma

He had noticed Sigma's chest, which was more noticeable than usual and how Sigma was slouching over to try to hide it

"Oh, You're home early!"

He smiled down at you, the nervousness seeping into his voice