Ultimate shoulder rides

I'm  having  a  little  difficulty  understanding  the subject  matter here.

I  suppose it would be  possible  to "force" someone to  carry another  person with  some  form of coercion/punishment  for  not  complying.  But  the  carrier  would  normally have  to comply  to  the wishes of  the rider even  if   the  carrier had  no  desire  to be  ridden.

Unless  it  was  some  fantasy  scenario involving  an  actual  legal  form of  slavery  where  a  slave  could be  put  to  use as a  beast of  burden  regardless of  the  slave's  will, the  carrier  must ,at the  very  least consent  to being put to  the  task.
Obviously  just  sitting on  someone's neck or  back cannot  turn  them into  a  willing beast of  burden.

I was with my friends sister who was 16 years old back in 1993 in their pool one summer and had an experience like that.  Her name is Danielle and she sat on the side of the pool and asked me to come over.  She then just gripped my head to move my closer and said "get down Vince" and again "Vince get down."  When I realized what she was doing I happily lowered myself and she sort of slid herself on my shoulders.  I then easily stood up with the lovely young lady on my shoulders (who was light as a feather) held her effortlessly as we and our friends were having chicken fights.  Danielle must have been on my shoulders for about 8 minutes before it was our turn to fight.  We lost our chicken fight but I felt that I was the real winner having the busty girl on my shoulders all that time.