Midnight's Shaft of Sunset

Three weeks later, Twilight was sat in the kitchen, staring at the wall, when Sunset walked up behind her, and kissed the top of her head.

“Morning, sweetie. What do you want to do today?”

“S-Sunset?“ Twilight stammered, “Could you, uh, sit down for a minute?”

Sunset complied, worried by Twilight's expression. Twilight continued:

“Hey, uh, you remember — funny thing, you remember that thing we did, three weekends back?”

Sunset gave Twilight a quizzical look before answering.

“Yeah, I'm not likely to forget that in a hurry.”

“You remember asking if there was any way I could get pregnant from that?”

Sunset's face remained neutral.

“Yeah…”

Twilight held up a small plastic object.

On which was a small blue line.

“I may have mis-calculated,” Twilight offered weakly.