That settled it. It might seem weird to anyone but Dana Scully, but watching her partner bleed out in front of her on repeat for who knows how long made her realize that they might not have all the time in the world. Both of their lives were ticking time bombs, and all she was doing was wasting time by refusing to acknowledge her feelings for him. After the body-swapping episode, she'd filed the idea of asking Mulder to be her sperm donor away in the back of her mind. It just hadn't been the most crucial thing to bring up with everything going on.
But confronting their mortality had cracked the dam. She had made up her mind to ask him. Regardless of how he took it, it was time for her to start taking charge and asking for what she wanted. She was tired of wasting time, tired of rationalizing that there was always something more important going on at the moment than her personal struggles. It was now or never. She decided on now.
That was why she called him that Monday night and asked him to come over, she had something to discuss with him.