this was suggested by  curly-wolf a whiiiile ago but it stuck with me haha

[start ID: a colored drawing of Rarity and Pistachio cuddling in a bed. Rarity is wearing a pink diaper, and laying behind him hugging him with one hoof. She is resting her head on top of his and looking down at him lovingly. Pistachio is wearing a blue long sleeve onesie with purple flowers and sucking on a mint colored pacifier. He is closing his eyes and smiling sleepily. end ID]

The idea behind this is that they room together for some fancy fashion event and Rarity helps him deal with the stress by babying him before bed :3
Side note but I basically had to do this all on one layer, bc I colored the ponies on the same layer as the background.. grrrrrrrr. never making that mistake again