This is from a bonus 4-page leaflet for those who bought Hajimete no Hitozuma via the Toranoana bookstores. Most copies seem to be sold out, and the ones in circulation are pricey as hell. So for the foreseeable future, these two pages are all that's available.
dammit !! when are we gonna get a NEW story from Shinozuka Yuuji ?!? the man draws top-notch MILFS and always finds perfect balance between NTR and cheating... if only he was on PIXIV or Twitter he would see how big his fanbase is both in Japan and overseas as well, hehe