This comic is based on the following short story by Kassaz:
https://www.fimfiction.net/story/526921/10/short-stories-with-pregnant-ponies/knock-it-off

This is the featureless version.

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“C’mon, knock it off.” Scootaloo sat before Rainbow Dash, who was keeping an eye on her poorly, meaning Scootaloo was playing in her den while Rainbow Dash slept on the couch.

Rainbow would’ve taken Scootaloo flying, or performed tricks while Scootaloo watched, but her late pregnancy sapped her vigor, so it was up to Scootaloo to make her own fun. Eventually, the fun included Rainbow’s sleeping form. Balanced on Rainbow’s barrel was one of Tank’s chew toys. Rainbow had already shown Scootaloo the ins and outs of her ins and outs, and Scootaloo got it in her head to see if she could make the foal do a trick.

Rainbow’s breathing was gentle, and neither of them moved, however. Scootaloo reared on the couch, and poked Rainbow’s belly with a hoof. “Knock it off, squirt.” Rainbow was asleep again before the last syllable.

“She’s not even trying.” Scootaloo complained, misunderstanding.