Now in the game, there are 5 roles, your top laner, which is usually a tanky champion; your mid laner, which is the spellcaster; your jungler, who helps the other champions by attacking by surprise; your ADC, which is your ranged shooter and a large source of damage; and finally, your support, which usually helps the ADC.
Supports also have the job to protect the ADC. They can do this through healing them or giving shields. Protecting your friend emotionally is very important, as one of the best things you can do for a person is help them feel safe. This could be done by listening to them, being there for them, and of course the honorary crying on the shoulder.
Finally, supports can also harass the other ADC and support, therefore making it easy for the ADC to potentially get kills. This translates as going above and beyond simply being there as a therapist. This means buying gifts for birthdays, driving around his or her siblings, doing her favors that might seem highly inconvenient. Of course, supports must be careful not to be killed themselves while harassing. In the same way, be careful not to be a slave; you are still your own independent person, and therefore are not obligated to like everything that the person you like does. Don't be afraid to tell them no.