Rainbow Dash has caught a cold after flying in some particularly bad weather, and Fluttershy insists that she stay with her until she recovers.

Dash starts to get a little too comfortable around the house, and Fluttershy doesn't exactly seem to mind...

A little thing I wrote a long time ago and finally decided to share here!
Weight Gain story with a little FlutterDash. Tagged as 'Sex' to be on the safe side.