去年的两张舟图，画了外敷和奶奶，风笛的衣服是私服

2 Arknights drawings from last year. I drew my waifu and grandma. Bagpipe's clothes are casual

The artist is calling Surtr gandma due to an "emote":https://jikipedia.com/definition/614908862 shopped with Surtr, where she says "You bastard, your grandma Surtr is here".