Some would say there is no better way to relax than a Pyjama and Switch day. I imagine putting the phone on silent and immersing oneself in Animal Crossing is a great way to forget, at least for a little while, about the constant burden of an ever-growing bosom. Everybody needs their time to unwind, after all.
The idea of a lapfull of boob is quite impressive in its own right. Indeed, one of the themes that often gets overlooked when speculating about enormous breasts is how the bearer interacts with them in day to day life, and likewise, how the breasts interact with the bearer; for example, the breasts often coming into contact with parts of the body that, if they were of a more regular size, would never meet.
Sitting cross-legged has a couple of advantages for a heavily-endowed young lady; it provides a resonably comfortable position that allows the protagonist to lean forward and gain support for her heaving bosom with her 'lap' acting as a sort of 'cradle' - although one could argue that the 'cradle runneth over' as it were! Still, it offers some support, and as an added bonus, gives our engrossed gamer girl somewhere comfortable to rest her arms!
I'm not sure about the glasses? I thought they would make a change as I don't often draw characters with them (with the exception of safety glasses of course), but geeky girls are awesome and it adds to the charm in my opinion...