In the end, Fiona discovered the hard way that she couldn't even dream of taking all of Nova's penis inside her little mouth.
'Damn it! This is too big! Do all men have one like this?! No wonder most guys want a harem, the woman's mouth must be tired and they want to help her swap with someone else! Now it makes sense...'
Fiona's thoughts got the better of her, as she slowed down, this made Nova suspect something and asked, "Fiona? Are you okay?"
When she heard him say this, she blushed and started talking with her full mouth, "I'm sowwy, I goo dstracted." Nova could barely make her words before he understood what happened.
Most probably, Fiona was a little bit taken aback by seeing that her tiny mouth couldn't 'devour' his little brother..
"You don't have to force yourself too much. Everything should come naturally..." Fiona heard him say this, and for a reason she felt belittled.