Sam Morris, 35, said the only consolation in the tragedy was that the couple died side-by-side doing something they both loved. He said: "They were in love since they met in their first year of university. They were just so soft and sweet with each other - two people so at ease together. They were having fun making plans.
"They had dreams of doing voluntary work oversees together. Some of the comfort we have drawn is that these guys had been together to the end. At least they were doing what they liked doing."
Mr Morris, who worked with Mr Chesters and Mr Bell when they were mountain bike tour guides in the Alps, added: "All four of them were people with a bright future and all of them were committed to making a difference. It's such a loss."
Tragedy struck at about 2pm on Saturday as the group of friends made their descent on Bidean Nam Bian in Glencoe. One member of the party, an un-named man, survived by leaping from the collapsing sheet of snow and hammering an ice axe into firmer ground.
A 24-year-old woman from the Durham area, who was seriously hurt in the incident, remains in a critical condition in hospital in Glasgow.