Curiosity about what her insides looked like abounded in your mind, so you decided to make your way inside Isabelle's rear. Her buttcheeks were rather soft, though you had to gauge your strength spells carefully—didn't want to get stuck if she clenched again, but you also didn't want to accidentally wake her up by accident. It took a bit of work, but you did ultimately make your way inside, with Isabelle only making a few pleasured mumbles and squirms in response.
Once inside, you were relieved—while the smell of dinner and coconut milk was around, thankfully it was remarkably clean, aside from the sweat droplets. A flash of green caught your eye, though, and you turned to see that there were leaves in her ass! Now why would she...? Wait a minute... With a quick scrying spell, you confirmed that these were, in fact, leafified furniture items like those that appear in the games. A bit strange that she put them in here, of all places, but they did always pull them out of hammerspace back there in the games... And it wasn't that much of a jump to conclusions. As for what the furniture was, there was a variety of chairs, desks, shelving units, beds a shocking number of appliances, and even a few carpets and wallpapers among other things.
Seeing them all in here, you had an idea... how about you use them? Either you could bring these items out and make a miniature office space for yourself inside Isabelle's house, or you could decorate somewhere inside her body as one! You could already see for yourself that her ass was more than large enough to hold you, and the smell was remarkably pleasant... And your magic could certainly deal with any other inconveniences that might occur. Convincing Isabelle may be difficult, though...