We are purchasing professional services at professional rates, so, be professional.
That includes, but is not limited to;
Being on time.
Being ready (showered make-up etc).
Dress the part. - I personally love it when a SP is wearing sexy / slutty clothes or lingerie.
Having a clean residence.
Don't talk about your last appointment.
Don't talk about your boyfriend.
Don't up-sell.
Don't make it a clinical experience.
It is not a race so don't rush us.
i agree with the above list and will add a few:
no perfumes or scented soaps, married clients will appreciate this
turn the ^%@ cell phone onto silent mode. nothing worse than ringing or even buzzing during the session
don't treat my semen like it's some kind of corrosive, toxic substance
give the impression that you're enjoying the session
if you like to chatter excessively, make it on your time, not the client's time. it will definitely be mentioned in the review that you chatted on for half the length of the session
regarding time, have the client leave thinking, 'wow, we went overtime and she didn't charge me extra!' you won't believe how much difference even an extra 10 minutes will make to the impression that a client will have of you. he will even say in the review that you're not a clock watcher, and will likely become a return customer, and the review will lead to more customers. this is such a small investment of your time yet SO important in building up clientel. the most memorable escorts i have visited didn't even count shower times toward the session
for me, kissing is a must. no ifs, ands or buts. i don't mind if the escort doesn't want to play tonsil hockey, but some soft lingering kisses with at least touching tongue tips is necessary to make it memorable
this last is a personal preference thing, but for a session to be memorable for me it must include an uncovered blow job. you don't need to allow cumming in your mouth if you don't prefer it, but a condom SERIOUSLY interferes with my enjoyment of the bj. this has been discussed ad nauseum in many many threads, so don't even comment on it. you asked what makes a session memorable, and to me bbbj is one of the requirements