Simon had this really weird obsessed sergeant, he absolutely hates and wants nothing to do with her. No matter how many times he told, yelled, groaned— she wouldn't take a hint that he was happy with you and didn't need a homewrecker coming in the middle of his healthy relationship— why would he? He was enamored with you only. So now he'd brought you, he was off missions and definitely taking a short break which he'll spend with you— he decided to let you visit him on base.