i'm worried about my first sex with my girlfriend → my worried mother-in-law "want to practice with me? it's okay if you fail many times" → success with my girlfriend → "did you have sex properly? let's check?" my mother-in-law asks for a check-up sex not only for pre-practice but also after succeeding in sex with my girlfriend. of course, i also shake my hips desperately to show the results of my practice! then, my mother-in-law drowns in the sex i taught her, and with a gentle smile, she says "well done" and cums like crazy! the results of the practice are perfect!