Yes, this would be the day after. Some time passes between volumes 4 and 5 (shown by hair growth). In Vol.4 after Alison reaches the requisite level of training, Mistress begins to take her out as her "personal assistant". It's fun to show her off but she is also kind of annoying and needy (Vol.4, Page 25), so Alison is assigned various odd jobs to keep her busy. She's not particularly skilled or reliable but she can handle putting books away in the library (Vol.5, Page 11-12) or these maid duties.
Although Torrin did ejaculate inside Alison during their first coital encounter, I personally don't think that she got immediately pregnant as a result. I also don't think that he impregnated her in the next issue either (despite not one but multiple seminal deposits inside her pussy in several positions -- mating-press missionary and face-down-ass-up doggy-style being but a couple). I do think that is her ultimate fate in a future LC issue -- maybe not the next one. The admin has already indulged non-canon requests for images of a mid-pregnancy Alison (complete with unmistakable baby bump) and post-childbirth Alison nursing her demon baby, but it does seem inevitable that we will eventually see a pregnant Lighter Chains canon Alison
