This is very sweet. I love the hint of magic in First Kiss (puts new meaning to the term 'making sparks fly'), the old-fashioned quality of Newlyweds (aw...), the sense of contented domesticity of Nesting (and love the hint of her pregnant belly!) and the last, First Steps, just tears at my heart.
Baby Severus is just too darling, but it is his slightly uncertain expression, yet willingness to trust... *sniff* That might well have been the last time in his life he was still trusting and able to ask for or expect affection. That just breaks my flinty old heart. Very well done, indeed.