Wow! Very well written. Talk about creative take-off from a prompt! Go you. \o/
Love the ending scene, it's definitely got power and beauty and the quiet pride of their new resolve, along with the rather scary fear of what they're all getting into! Also: love that Severus talks, and designs the Mark! I guess ex-Death Eater, ex-Professor, ex-Spy, ex-Headmaster, ex-Dumbledore's & Voldemort's man Snape has got the experience they'll be needing! Quiet life with the kids, my eye.