I couldn't find any tickling pictures of Tali... so I made one...
I adore her feet. And so does that varren. For pictures like this, its best not to wrack your head over how this came to be. Just enjoy a rare sight of Tali having her large pale quarian feet at the mercy of a large lavishing lapping tongue.
(alts *lineart sta.sh/029g5pk2l6kz