The Good Son (Patreon)
Content
They named him Edgar (Allen Piggie)
Midnight's whole relationship with PB started off as 100% experimental, so when Peebs teasingly asked what cutesy boyfriend pet name she'd bestow upon him, Midnight answered "....guinea pig". Over time, the pet name gets used with less dry sarcasm and with slowly increasing sincerity (but only in private, Midnight would probably quietly hex the first pony to catch her acting cute with that accursed Sandwich boy)
Edgar is rightly loved by his "parents" and both Midnight and PB make him miniature "pies", "cakes", and other treats (all made entirely out of hay, fruits, and vegetables)